SkyMentor ND2 Neutral Density Filter - 52% Transmission - 1.25" - ND2 5mm Eyepieces 25" focuser barrel

25" focuser barrel

Used with a PC/Windows and specific iPolar software

and opticians know that these mirrors require more sophisticated testing to obtain the desired Aspheric surface figure

The prime focus focal plane is located near the front aperture of the optical system

SkyMentor ND2 Neutral Density Filter - 52% Transmission - 1.25" - ND2 5mm Eyepieces 25" focuser barrelSkyMentor ND2 1. 25" Neutral Density Filter This Neutral Density (ND) filter is suitable for 1. 25" eyepieces & other 1. 25" barreled accessories. Preferred as a moon filter due to its neutral color, the ND2 filter can reduce the overall brightness of the moon's surface by 48% so you can see more details and surface features of moon with your telescope. We also offer two other Neutral Density filters with varying degrees of light attenuation: ND2